[class^="icons-"]{
    display: inline-block;
    width: 50px;
    height: 50px;
    margin-top: 1px;
    margin-right: .3em;
    line-height: 50px;
    vertical-align: text-top;
    background-image: url("../img/icon-set.png");
    background-repeat: no-repeat;
}

.icons-uno{background-position: 148px 148px;}